NAME

SYNOPSIS

DESCRIPTION

This file sets options that apply to Shorewall6 as a whole.
The file consists of Shell comments (lines beginning with ´#´), blank
lines and assignment statements (variable=value).

OPTIONS

Many options have as their value a log-level. Log levels are a method
of describing to syslog (8) the importance of a message and a number of
parameters in this file have log levels as their value.
These levels are defined by syslog and are used to determine the
destination of the messages through entries in /etc/syslog.conf (5).
The syslog documentation refers to these as "priorities"; Netfilter
calls them "levels" and Shorewall6 also uses that term.
Valid levels are:
7 debug
6 info
5 notice
4 warning
3 err
2 crit
1 alert
0 emerg
For most Shorewall6 logging, a level of 6 (info) is appropriate.
Shorewall6 log messages are generated by NetFilter and are logged using
facility ´kern´ and the level that you specifify. If you are unsure of
the level to choose, 6 (info) is a safe bet. You may specify levels by
name or by number.
If you have built your kernel with NFLOG target support, you may also
specify a log level of NFLOG (must be all caps). Rather than log its
messages to syslogd, Shorewall6 will direct netfilter to log the
messages via the NFLOG target which will send them to a process called
´ulogd´. ulogd is available with most Linux distributions (although it
probably isn´t installed by default). Ulogd is also available from
http://www.netfilter.org/projects/ulogd/index.html and can be
configured to log all Shorewall6 message to their own log file
The following options may be set in shorewall6.conf.
ACCEPT_DEFAULT={action|macro|none}
DROP_DEFAULT={action|macro|none}
REJECT_DEFAULT={action|macro|none}
QUEUE_DEFAULT={action|macro|none}
NFQUEUE_DEFAULT={action|macro|none}
To allow for default rules to be applied when USE_ACTIONS=No, the
DROP_DEFAULT, REJECT_DEFAULT, ACCEPT_DEFAULT, QUEUE_DEFAULT and
NFQUEUE_DEFAULT options have been added.
DROP_DEFAULT describes the rules to be applied before a connection
request is dropped by a DROP policy; REJECT_DEFAULT describes the
rules to be applied if a connection request is rejected by a REJECT
policy. The other three are similar for ACCEPT, QUEUE and NFQUEUE
policies.
The value applied to these may be:
a) The name of an
action.
b) The name of a macro
(Shorewall6-shell only)
c) None or none The default values are:
DROP_DEFAULT="Drop"
REJECT_DEFAULT="Reject"
ACCEPT_DEFAULT="none"
QUEUE_DEFAULT="none"
NFQUEUE_DEFAULT="None" If USE_ACTIONS=Yes, then these values
refer to action.Drop and action.Reject respectively. If
USE_ACTIONS=No, then these values refer to macro.Drop and
macro.Reject.
If you set the value of either option to "None" then no default
action will be used and the default action or macro must be
specified in shorewall6-policy[1](5).
ACCOUNTING=[Yes|No]
Added in Shorewall 4.5.0. If set to Yes, Shorewall6 accounting is
enabled (see shorewall6-accounting[2](5)). If not specified or set
to the empty value, ACCOUNTING=Yes is assumed.
ADMINISABSENTMINDED=[Yes|No]
The value of this variable affects Shorewall6´s stopped state. When
ADMINISABSENTMINDED=No, only traffic to/from those addresses listed
in shorewall6-routestopped[3](5) is accepted when Shorewall6 is
stopped. When ADMINISABSENTMINDED=Yes, in addition to traffic
to/from addresses in shorewall6-routestopped[3](5), connections
that were active when Shorewall6 stopped continue to work and all
new connections from the firewall system itself are allowed. If
this variable is not set or is given the empty value then
ADMINISABSENTMINDED=No is assumed.
AUTO_COMMENT=[Yes|No]
If set, if there is not a current comment when a macro is invoked,
the behavior is as if the first line of the macro file was "COMMENT
<macro name>". The AUTO_COMMENT option has a default value of
´Yes´.
AUTOMAKE=[Yes|No]
If set, the behavior of the start and restart commands is change;
if no files in /etc/shorewall have been changed since the last
successful start or restart command, then the compilation step is
skipped and the compiled script that executed the last start or
restart command is used. The default is AUTOMAKE=No.
The setting of the AUTOMAKE option is ignored if the start or
restart command includes a directory name (e.g., shorewall6restart/etc/shorewall.new).
BLACKLIST_DISPOSITION=[DROP|REJECT]
This parameter determines the disposition of packets from
blacklisted hosts. It may have the value DROP if the packets are to
be dropped or REJECT if the packets are to be replied with an ICMP
port unreachable reply or a TCP RST (tcp only). If you do not
assign a value or if you assign an empty value then DROP is
assumed.
BLACKLIST_LOGLEVEL=[log-level]
This parameter determines if packets from blacklisted hosts are
logged and it determines the syslog level that they are to be
logged at. Its value is a syslog level (Example:
BLACKLIST_LOGLEVEL=debug). If you do not assign a value or if you
assign an empty value then packets from blacklisted hosts are not
logged.
BLACKLISTNEWONLY={Yes|No}
When set to Yes or yes, blacklists are only consulted for new
connections. When set to No or no, blacklists are consulted for
every packet (will slow down your firewall noticably if you have
large blacklists). If the BLACKLISTNEWONLY option is not set or is
set to the empty value then BLACKLISTNEWONLY=No is assumed.
Note
BLACKLISTNEWONLY=No is incompatible with FASTACCEPT=Yes.
CLAMPMSS=[Yes|No|value]
This parameter enables the TCP Clamp MSS to PMTU feature of
Netfilter and is usually required when your internet connection is
through PPPoE or PPTP. If set to Yes or yes, the feature is
enabled. If left blank or set to No or no, the feature is not
enabled.
Important: This option requires CONFIG_IP_NF_TARGET_TCPMSS in your
kernel.
You may also set CLAMPMSS to a numeric value (e.g., CLAMPMSS=1400).
This will set the MSS field in TCP SYN packets going through the
firewall to the value that you specify.
CLEAR_TC=[Yes|No]
If this option is set to No then Shorewall6 won´t clear the current
traffic control rules during [re]start. This setting is intended
for use by people that prefer to configure traffic shaping when the
network interfaces come up rather than when the firewall is
started. If that is what you want to do, set TC_ENABLED=Yes and
CLEAR_TC=No and do not supply an /etc/shorewall6/tcstart file. That
way, your traffic shaping rules can still use the “fwmark”
classifier based on packet marking defined in
shorewall6-tcrules[4](5). If not specified, CLEAR_TC=No is assumed.
Warning
If you also run Shorewall and if you have TC_ENABLED=Internal in
your shorewall-conf[5](5), then you will want CLEAR_TC=No in this
file.
CONFIG_PATH=[directory[:directory]...]
Specifies where configuration files other than shorewall6.conf may
be found. CONFIG_PATH is specifies as a list of directory names
separated by colons (":"). When looking for a configuration file
other than shorewall6.conf:
· If the command is "try" or a "<configuration directory>" was
specified in the command (e.g., shorewall6check./gateway)
then the directory given in the command is searched first.
· Next, each directory in the CONFIG_PATH setting is searched in
sequence.
If CONFIG_PATH is not given or if it is set to the empty value
then the contents of /usr/share/shorewall6/configpath are used.
As released from shorewall.net, that file sets the CONFIG_PATH
to /etc/shorewall6:/usr/share/shorewall6:/usr/share/shorewall
but your particular distribution may set it differently. See
the output of shorewall6 show config for the default on your
system.
Note that the setting in /usr/share/shorewall6/configpath is
always used to locate shorewall6.conf.
DELETE_THEN_ADD={Yes|No}
If set to Yes (the default value), entries in the
/etc/shorewall6/route_stopped files cause an ´ip rule del´ command
to be generated in addition to an ´ip rule add´ command. Setting
this option to No, causes the ´ip rule del´ command to be omitted.
DONT_LOAD=[module[,module]...]
Causes Shorewall6 to not load the listed kernel modules.
EXPAND_POLICIES={Yes|No}
Normally, when the SOURCE or DEST columns in shorewall6-policy(5)
contains ´all´, a single policy chain is created and the policy is
enforced in that chain. For example, if the policy entry is
#SOURCE DEST POLICY LOG
# LEVEL
net all DROP info
then the chain name is ´net2all´ which is also the chain named in
Shorewall6 log messages generated as a result of the policy. If
EXPAND_POLICIES=Yes, then Shorewall6 will create a separate chain
for each pair of zones covered by the policy. This makes the
resulting log messages easier to interpret since the chain in the
messages will have a name of the form ´a2b´ where ´a´ is the SOURCE
zone and ´b´ is the DEST zone.
EXPORTPARAMS={Yes|No}
It is quite difficult to code a ´params´ file that assigns other
than constant values such that it works correctly with Shorewall6
Lite. The EXPORTPARAMS option works around this problem. When
EXPORTPARAMS=No, the ´params´ file is not copied to the compiler
output.
With EXPORTPARAMS=No, if you need to set environmental variables on
the firewall system for use by your extension scripts, then do so
in the init extension script.
The default is EXPORTPARAMS=Yes which is the recommended setting
unless you are running Shorewall6 Lite.
FASTACCEPT={Yes|No}
Normally, Shorewall6 defers accepting ESTABLISHED/RELATED packets
until these packets reach the chain in which the original
connection was accepted. So for packets going from the ´loc´ zone
to the ´net´ zone, ESTABLISHED/RELATED packets are ACCEPTED in the
´loc2net´ chain.
If you set FASTACCEPT=Yes, then ESTABLISHED/RELEATED packets are
accepted early in the INPUT, FORWARD and OUTPUT chains. If you set
FASTACCEPT=Yes then you may not include rules in the ESTABLISHED or
RELATED sections of shorewall6-rules[6](5).
Note
FASTACCEPT=Yes is incompatible with BLACKLISTNEWONLY=No.
HIGH_ROUTE_MARKS={Yes|No}
You may set HIGH_ROUTE_MARKS=Yes in to effectively divide the
packet mark and connection mark into two mark fields.
The width of the fields are determined by the setting of the
WIDE_TC_MARKS option.
When WIDE_TC_MARKS=No (the default):
1. The MARK field in the providers file must have a value that is
less than 65536 and that is a multiple of 256 (using hex
representation, the values are 0x0100-0xFF00 with the low-order
8 bits being zero).
2. You may only set those mark values in the PREROUTING chain.
3. Marks used for traffic shaping must still be in the range of
1-255 and may still not be set in the PREROUTING chain.
When WIDE_TC_MARKS=Yes:
1. The MARK field in the providers file must have a value that is
a multiple of 65536 (using hex representation, the values are
0x010000-0xFF0000 with the low-order 16 bits being zero).
2. You may only set those mark values in the PREROUTING chain.
3. Marks used for traffic shaping must be in the range of 1-16383
and may still not be set in the PREROUTING chain.
Regardless of the setting of WIDE_TC_MARKS, when you SAVE or
RESTORE in tcrules, only the TC mark value is saved or
restored. Shorewall handles saving and restoring the routing
(provider) marks.
IMPLICIT_CONTINUE={Yes|No}
When this option is set to Yes, it causes subzones to be treated
differently with respect to policies.
Subzones are defined by following their name with ":" and a list of
parent zones (in shorewall6-zones[7](5)). Normally, you want to
have a set of special rules for the subzone and if a connection
doesn´t match any of those subzone-specific rules then you want the
parent zone rules and policies to be applied; see
shorewall6-nesting[8](5). With IMPLICIT_CONTINUE=Yes, that happens
automatically.
If IMPLICIT_CONTINUE=No or if IMPLICIT_CONTINUE is not set, then
subzones are not subject to this special treatment. With
IMPLICIT_CONTINUE=Yes, an implicit CONTINUE policy may be
overridden by including an explicit policy (one that does not
specify "all" in either the SOURCE or the DEST columns).
IP=[pathname]
If specified, gives the pathname of the ´ip´ executable. If not
specified, ´ip´ is assumed and the utility will be located using
the current PATH setting.
IP_FORWARDING=[On|Off|Keep]
This rather useless parameter determines whether Shorewall6 enables
or disables IPV6 Packet Forwarding on all interfaces
(/proc/sys/net/ipv6/config/all/forwarding). Possible values are:
On or on
packet forwarding will be enabled.
Off or off
packet forwarding will be disabled.
Keep or keep
Shorewall6 will neither enable nor disable packet forwarding
If this variable is not set or is given an empty value
(IP_FORWARD="") then IP_FORWARD=On is assumed.
IP6TABLES=[pathname]
This parameter names the ip6tables executable to be used by
Shorewall6. If not specified or if specified as a null value, then
the ip6tables executable located using the PATH option is used.
Regardless of how the ip6tables utility is located (specified via
IP6TABLES= or located via PATH), Shorewall6 uses the
ip6tables-restore and ip6tables-save utilities from that same
directory.
IPSET=[pathname]
If specified, gives the pathname of the ´ipset´ executable. If not
specified, ´ipset´ is assumed and the utility will be located using
the current PATH setting.
KEEP_RT_TABLES={Yes|No}
When set to Yes, this option prevents scripts generated by
Shorewall6 from altering the /etc/iproute2/rt_tables database when
there are entries in /etc/shorewall6/providers. If you set this
option to Yes while Shorewall6 (Shorewall6-lite) is running, you
should remove the file /var/lib/shorewall6/rt_tables
(/var/lib/shorewall6-lite/rt_tables) before your next stop,
refresh, restore on restart command.
The default is KEEP_RT_TABLES=No.
LOG_VERBOSITY=[number]
This option controls the amount of information logged to the file
specified in the STARTUP_LOG option.
Values are:
-1 - Logging is disabled
0 - Silent. Only error messages are logged.
1 - Major progress messages logged.
2 - All progress messages logged If not specified, then -1 is
assumed.
LOGALLNEW=[log-level]
This option is intended for use as a debugging aid. When set to a
log level, this option causes Shorewall6 to generate a logging rule
as the first rule in each builtin chain.
· The table name is used as the chain name in the log prefix.
· The chain name is used as the target in the log prefix.
For example, using the default LOGFORMAT, the log prefix for
logging from the nat table´s PREROUTING chain is:
Shorewall:nat:PREROUTING
Important
To help insure that all packets in the NEW state are logged, rate
limiting (LOGBURST and LOGRATE) should be disabled when using
LOGALLNEW. Use LOGALLNEW at your own risk; it may cause high CPU
and disk utilization and you may not be able to control your
firewall after you enable this option.
Caution
Do not use this option if the resulting log messages will be sent
to another system.
LOGFILE=[pathname]
This parameter tells the /sbin/shorewall6 program where to look for
Shorewall6 messages when processing the dump, logwatch, showlog,
and hits commands. If not assigned or if assigned an empty value,
/var/log/messages is assumed.
LOGFORMAT=["formattemplate"]
The value of this variable generate the --log-prefix setting for
Shorewall6 logging rules. It contains a “printf” formatting
template which accepts three arguments (the chain name, logging
rule number (optional) and the disposition). To use LOGFORMAT with
fireparse, set it as:
LOGFORMAT="fp=%s:%d a=%s "
If the LOGFORMAT value contains the substring “%d” then the logging
rule number is calculated and formatted in that position; if that
substring is not included then the rule number is not included. If
not supplied or supplied as empty (LOGFORMAT="") then
“Shorewall6:%s:%s:” is assumed.
LOGBURST=[burst]
LOGRATE=[rate/{minute|second}]
These parameters set the match rate and initial burst size for
logged packets. Please see ip6tables(8) for a description of the
behavior of these parameters (the ip6tables option --limit is set
by LOGRATE and --limit-burst is set by LOGBURST). If both
parameters are set empty, no rate-limiting will occur.
Example:
LOGRATE=10/minute
LOGBURST=5
For each logging rule, the first time the rule is reached, the
packet will be logged; in fact, since the burst is 5, the first
five packets will be logged. After this, it will be 6 seconds (1
minute divided by the rate of 10) before a message will be logged
from the rule, regardless of how many packets reach it. Also, every
6 seconds which passes without matching a packet, one of the bursts
will be regained; if no packets hit the rule for 30 seconds, the
burst will be fully recharged; back where we started.
LOGTAGONLY=[Yes|No]
Using the default LOGFORMAT, chain names may not exceed 11
characters or truncation of the log prefix may occur. Longer chain
names may be used with log tags if you set LOGTAGONLY=Yes. With
LOGTAGONLY=Yes, if a log tag is specified then the tag is included
in the log prefix in place of the chain name.
MACLIST_DISPOSITION=[ACCEPT|DROP|REJECT]
Determines the disposition of connections requests that fail MAC
Verification and must have the value ACCEPT (accept the connection
request anyway), REJECT (reject the connection request) or DROP
(ignore the connection request). If not set or if set to the empty
value (e.g., MACLIST_DISPOSITION="") then
MACLIST_DISPOSITION=REJECT is assumed.
MACLIST_LOG_LEVEL=[log-level]
Determines the syslog level for logging connection requests that
fail MAC Verification. The value must be a valid syslogd log level.
If you don´t want to log these connection requests, set to the
empty value (e.g., MACLIST_LOG_LEVEL="").
MACLIST_TABLE=[filter|mangle]
Normally, MAC verification occurs in the filter table (INPUT and
FORWARD) chains. When forwarding a packet from an interface with
MAC verification to a bridge interface, that doesn´t work.
This problem can be worked around by setting MACLIST_TABLE=mangle
which will cause Mac verification to occur out of the PREROUTING
chain. Because REJECT isn´t available in that environment, you may
not specify MACLIST_DISPOSITION=REJECT with MACLIST_TABLE=mangle.
MARK_IN_FORWARD_CHAIN=[Yes|No]
If your kernel has a FORWARD chain in the mangle table, you may set
MARK_IN_FORWARD_CHAIN=Yes to cause the marking specified in the
tcrules file to occur in that chain rather than in the PREROUTING
chain. This permits you to mark inbound traffic based on its
destination address when DNAT is in use. To determine if your
kernel has a FORWARD chain in the mangle table, use the
/sbin/shorewall6showmangle command; if a FORWARD chain is
displayed then your kernel will support this option. If this option
is not specified or if it is given the empty value (e.g.,
MARK_IN_FORWARD_CHAIN="") then MARK_IN_FORWARD_CHAIN=No is assumed.
MASK_BITS=bits
Added in Shorewall 4.5.0. This option specifies the number of bits
to use as a mask for traffic shaping marks and must be greater than
or equal to TC_BITS. The default value depends on the setting of
WIDE_TC_MARKS:
WIDE_TC_MARKS=No - 8 bits.
WIDE_TC_MARKS=Yes - 16 bits.
MODULE_SUFFIX=["extension ..."]
The value of this option determines the possible file extensions of
kernel modules. The default value is "o gz ko o.gz".
MODULESDIR=[pathname[:pathname]...]
This parameter specifies the directory/directories where your
kernel netfilter modules may be found. If you leave the variable
empty, Shorewall6 will supply "/lib/modules/‘uname
-r‘/kernel/net/ipv4/netfilter:/lib/modules/‘uname
-r‘/kernel/net/ipv4/netfilter".
MUTEX_TIMEOUT=[seconds]
The value of this variable determines the number of seconds that
programs will wait for exclusive access to the Shorewall6 lock
file. After the number of seconds corresponding to the value of
this variable, programs will assume that the last program to hold
the lock died without releasing the lock.
If not set or set to the empty value, a value of 60 (60 seconds) is
assumed.
An appropriate value for this parameter would be twice the length
of time that it takes your firewall system to process a shorewall6restart command.
OPTIMIZE=[0|1]
Traditionally, Shorewall6 has created rules for thecompletematrixofhostgroupsdefinedbythezones,interfacesandhostsfiles[9].
Any traffic that didn´t correspond to an element of that matrix was
rejected in one of the built-in chains. When the matrix is sparse,
this results in lots of largely useless rules.
These extra rules can be eliminated by setting OPTIMIZE=1.
The OPTIMIZE setting also controls the suppression of redundant
wildcard rules (those specifying "all" in the SOURCE or DEST
column). A wildcard rule is considered to be redundant when it has
the same ACTION and Log Level as the applicable policy.
PATH=pathname[:pathname]...
Determines the order in which Shorewall6 searches directories for
executable files.
PROVIDER_BITS=bits
Added in Shorewall 4.5.0. Specifies the number of bits of the
packet/connection mark to use for the provider (routing) mark.
Provider mark values must be >= 2**PROVIDER_OFFSET and less than
2**(PROVIDER_OFFSET + PROVIDER_BITS). The default value is 8 bits.
PROVIDER_OFFSET=offset
Added in Shorewall 4.5.0. Specifies the offset in bits from the
least significate bit of the packet/connection mark where the
Provider Mark value is stored. The default is based on the settings
of HIGH_ROUTE_MARKS and WIDE_TC_MARKS:
HIGH_ROUTE_MARKS=No - 0 bits.
HIGH_ROUTE_MARKS=Yes and WIDE_TC_MARKS=No - 8
bits.
HIGH_ROUTE_MARKS=Yes and WIDE_TC_MARKS=Yes - 16
bits.
RCP_COMMAND="command"RSH_COMMAND="command"
Eariler generations of Shorewall6 Lite required that remote root
login via ssh be enabled in order to use the load and reload
commands. Beginning with release 3.9.5, you may define an
alternative means for accessing the remote firewall system. In that
release, two new options were added to shorewall6.conf:.IP "" 4
RSH_COMMAND
RCP_COMMAND The default values for these are as follows:.IP ""
4 RSH_COMMAND: ssh ${root}@${system} ${command}
RCP_COMMAND: scp ${files}
${root}@${system}:${destination} Shell variables
that will be set when the commands are envoked are as
follows:.IP "" 4 root - root user. Normally
root but may be overridden using the ´-r´
option.
system - The name/IP address
of the remote firewall system.
command - For RSH_COMMAND,
the command to be executed on the firewall
system.
files - For RCP_COMMAND, a
space-separated list of files to be copied to the
remote
firewall system.
destination - The directory
on the remote system that the files are to be
copied
into.
RESTOREFILE=filename
Specifies the simple name of a file in /var/lib/shorewall6 to be
used as the default restore script in the shorewall6save,
shorewall6restore, shorewall6forget and shorewall6-fstart
commands.
SAVE_IPSETS={Yes|No}
If SAVE_IPSETS=Yes, then the current contents of your ipsets will
be saved by the shorewall6save command. Regardless of the setting
of SAVE_IPSETS, if saved ipset contents are available then they
will be restored by shorewall6restore.
SHOREWALL_SHELL=[pathname]
This option is used to specify the shell program to be used to
interpret the compiled script. If not specified or specified as a
null value, /bin/sh is assumed. Using a light-weight shell such as
ash or dash can significantly improve performance.
SMURF_LOG_LEVEL=[log-level]
Specifies the logging level for smurf packets (see the nosmurfs
option in shorewall6-interfaces[10](5)). If set to the empty value
( SMURF_LOG_LEVEL="" ) then smurfs are not logged.
STARTUP_ENABLED={Yes|No}
Determines if Shorewall6 is allowed to start. As released from
shorewall.net, this option is set to No. When set to Yes or yes,
Shorewall6 may be started. Used as a guard against Shorewall6 being
accidentally started before it has been configured.
STARTUP_LOG=[pathname]
If specified, determines where Shorewall6 will log the details of
each start, restart and refresh command. Logging verbosity is
determined by the setting of LOG_VERBOSITY above.
SUBSYSLOCK=[pathname]
This parameter should be set to the name of a file that the
firewall should create if it starts successfully and remove when it
stops. Creating and removing this file allows Shorewall6 to work
with your distribution´s initscripts. For RedHat, this should be
set to /var/lock/subsys/shorewall6. For Debian, the value is
/var/lock/shorewall6 and in LEAF it is /var/run/shorwall.
TC=[pathname]
If specified, gives the pathname of the ´tc´ executable. If not
specified, ´tc´ is assumed and the utility will be located using
the current PATH setting.
TC_BITS=bits
Added in Shorewall 4.5.0. This option replaces WIDE_TC_MARKS by
allowing you to specify the number of bits of the 32-bit
packet/connection mark to be used for traffic shaping. The default
value is based on the settings of WIDE_TC_MARKS:
WIDE_TC_MARKS=No - 8 bits.
WIDE_TC_MARKS=Yes - 14 bits. Mark values specified in
shorewall6-tcclasses(5)[11] must be < 2**TC_BITS.
TC_ENABLED=[Yes|No|Internal]
If you say Yes or yes here, Shorewall6 will use a script that you
supply to configure traffic shaping. The script must be named
´tcstart´ and must be placed in a directory on your CONFIG_PATH.
If you say No or no then traffic shaping is not enabled.
If you set TC_ENABLED=Internal or internal or leave the option
empty then Shorewall6 will use its builtin traffic shaper
(tc4shorewall6 written by Arne Bernin.
Warning
If you also run Shorewall and if you have TC_ENABLED=Internal in
your shorewall-conf[5](5), then you will want TC_ENABLED=No in this
file.
TC_EXPERT={Yes|No}
Normally, Shorewall6 tries to protect users from themselves by
preventing PREROUTING and OUTPUT tcrules from being applied to
packets that have been marked by the ´track´ option in
shorewall6-providers[12](5).
If you know what you are doing, you can set TC_EXPERT=Yes and
Shorewall6 will not include these cautionary checks.
TC_PRIOMAP=map
Added in Shorewall 4.5.0. Determines the mapping of a packet´s TOS
field to priority bands. See shorewall6-tcpri[13](5). The map
consists of 16 space-separated digits with values 1, 2 or 3. The
first entry corresponds to Linux priority 9, the second to Linux
priority 1, the third to Linux Priority 2, and so on. See
tc-prio(8) for additional information.
The default setting is TC_PRIOMAP="2 3 3 3 2 3 1 1 2 2 2 2 2 2 2
2".
TCP_FLAGS_DISPOSITION=[ACCEPT|DROP|REJECT]
Determines the disposition of TCP packets that fail the checks
enabled by the tcpflags interface option (see
shorewall6-interfaces[10](5)) and must have a value of ACCEPT
(accept the packet), REJECT (send an RST response) or DROP (ignore
the packet). If not set or if set to the empty value (e.g.,
TCP_FLAGS_DISPOSITION="") then TCP_FLAGS_DISPOSITION=DROP is
assumed.
TCP_FLAGS_LOG_LEVEL=[log-level]
Determines the syslog level for logging packets that fail the
checks enabled by the tcpflags interface option. The value must be
a valid syslogd log level. If you don´t want to log these packets,
set to the empty value (e.g., TCP_FLAGS_LOG_LEVEL="").
TRACK_PROVIDERS={Yes|No}
Added in Shorewall 4.4.3. When set to Yes, causes the track option
to be assumed on all providers defined in
shorewall6-providers[12](5). May be overridden on an individual
provider through use of the notrack option. The default value is
´No´.
Beginning in Shorewall 4.4.6, setting this option to ´Yes´ also
simplifies PREROUTING rules in shorewall6-tcrules[4](5).
Previously, when TC_EXPERT=No, packets arriving through ´tracked´
provider interfaces were unconditionally passed to the PREROUTING
tcrules. This was done so that tcrules could reset the packet mark
to zero, thus allowing the packet to be routed using the ´main´
routing table. Using the main table allowed dynamic routes (such as
those added for VPNs) to be effective. The
shorewall6-route_rules[14](5) file was created to provide a better
alternative to clearing the packet mark. As a consequence, passing
these packets to PREROUTING complicates things without providing
any real benefit. Beginning with Shorewall 4.4.6, when
TRACK_PROVIDERS=Yes and TC_EXPERT=No, packets arriving through
´tracked´ interfaces will not be passed to the PREROUTING rules.
Since TRACK_PROVIDERS was just introduced in 4.4.3, this change
should be transparent to most, if not all, users.
VERBOSITY=[number]
Shorewall6 has traditionally been very noisy (produced lots of
output). You may set the default level of verbosity using the
VERBOSITY OPTION.
Values are:
0 - Silent. You may make it more verbose using the -v
option
1 - Major progress messages displayed
2 - All progress messages displayed (pre Shorewall6-3.2.0
behavior) If not specified, then 2 is assumed.
WIDE_TC_MARKS={Yes|No}
When set to No (the default), traffic shaping marks are 8 bytes
wide (possible values are 1-255). When WIDE_TC_MARKS=Yes, traffic
shaping marks are 14 bytes wide (values 1-16383). The setting of
WIDE_TC_MARKS also has an effect on the HIGH_ROUTE_MARKS option
(see above).
ZONE2ZONE={2|-}
Added in Shorewall 4.4.4. This option determines how Shorewall
constructs chain names involving zone names and/or ´all´. The
default is ´2´ (e.g., fw2net).